Very interesting! So, .243 grove and .238 or .239 bore. Conventional "loose" bore 6mm is .237, and even using that, 115/117 gr. 6mm bullets will explode if you drive them too fast. This rifling will likely allow bullet to be driven to significantly higher velocities than conventional rifling without mid-flight blow-ups occurring.
What range to calibrate velocity and BC
- Thread starter ssatt68
- Start date
I know it sounds like I'm saying the world is round but the results ive had with confirming the mag speed out to 600 then tuning BC has been working and most of the guys I know that point bullets or run them at 3150 and up go through the same process. Most of the time I end up just confirming established numbers but as my barrel wears out I have to adjust my BC. Maybe my mag speed is uniquely accurate.
It would be as the lands are very large. I wonder if this can potentially have some negative effects. These large lands are swaging the lead into their shape, but not deforming the copper jacket into it the way conventional rifling does. Copper has spring-back, so I wonder if you can potentially end up with a lose core the way you do if you try and reduce a bullet's diameter by running it through a sizing ring.
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
k, if the barrel manf is willing to set up an export license, I will be able to import.
Otherwise, no joy.
If it hasn't been done, I would certainly swap scopes on the rifles just to make sure a scope tracking error is not at play here.
Even try another brand of scope. Alot of stuff can change at the upper ends of scope travel.
Cut rifle has been the rage for many years but it has been known that BUTTON rifled usually yield higher velocities mostly due to larger bores. The differences aren't always much and then there is the accurate velocity vs shear speed.
But it is there.
Enfield back in WWI figured out that 2 grooves was all they needed - which sped up manf and solved other issues. BUT the accuracy world migrated back to 4 and 6 groove post WWII testing. Had to be a reason.
Jerry
Otherwise, no joy.
If it hasn't been done, I would certainly swap scopes on the rifles just to make sure a scope tracking error is not at play here.
Even try another brand of scope. Alot of stuff can change at the upper ends of scope travel.
Cut rifle has been the rage for many years but it has been known that BUTTON rifled usually yield higher velocities mostly due to larger bores. The differences aren't always much and then there is the accurate velocity vs shear speed.
But it is there.
Enfield back in WWI figured out that 2 grooves was all they needed - which sped up manf and solved other issues. BUT the accuracy world migrated back to 4 and 6 groove post WWII testing. Had to be a reason.
Jerry
Right now im running 6slr but have run 6 creed and 243 in the past.
It's not the scope, shooter, faulty magneto speeds x3, atmospherics, height over bore
Or pixy dust. We had 6 team members out for a practice session and went through the findings with AB in a kestrel
And shooter ballistics. The only way to get the 0-600 curve and the 700-1200 curve to match and make sense was to up the BC
It's not the scope, shooter, faulty magneto speeds x3, atmospherics, height over bore
Or pixy dust. We had 6 team members out for a practice session and went through the findings with AB in a kestrel
And shooter ballistics. The only way to get the 0-600 curve and the 700-1200 curve to match and make sense was to up the BC
What made you decide to switch from the Creed to the SLR?
I've got a set of 6 Cree dies, but I've only been able to scrounge up 200 cases for it. Been looking at 6 SLR for a while... seems like a logical choice up here from the brass supply point of view. Easy to form too.
I've got a set of 6 Cree dies, but I've only been able to scrounge up 200 cases for it. Been looking at 6 SLR for a while... seems like a logical choice up here from the brass supply point of view. Easy to form too.
Ken Hagen from H and H talked me into it. He wanted all the team rifles to be the same and I had a bunch of win 243 brass. It's pretty much the same performance if the 6 creed but the brass lasts longer and is a little more stable. Ither thsn that the load is almost identical. Im going to slide away from the 6s and go back to the 6.5s this year. Most of the matches Im shooting now are out west and targets are starting to pop up at 11-12-13 and 1400 yards. The 6s will hit at that distance but the terminal performance on steel is un-impressive
Im not knocking F class but there is a lot of stuff they like and for good reason, but is hard to sell to a PR shooter. Two completely different games. PR guys are trying to get F class accurate rifles and ammo in a < 16 lb rifle and affordable enough to shoot 200 plus rounds in a weekend and lose sll of your brass
The last F class match I shot was with the 6.5 SAUM in 8-16 mph winds at academy in NC. 15 at 8-9 and 20 at 1k. I had 40 rds on the barrel so i took it out there to brake it in. Shot 499 28x with it the inly 9 was at 12 o'clock. My data started at 6.6 ended at 6.4. About 1year ago I took the saum out to 1822 on a 10" round. It took me a few to hit it but if it was a full IPSC I would have gone 1 st round on it. 6.5 SAUM is like nothing you've ever shot
I'm not getting what the PITA is about it. I picked up some R.P. cases, sized them down and mic'd them. It was clear that GAP's no turn reamer dimensions would require turning with the lot I had, but that just requires a reamer change to fix...
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
The Tech easily crosses over. My PRS rig will end up around 10lbs with scope. Right now, it is in a heavy stock but showing the ability to shoot in the 2's with the occasional high 1's group at 100yds. Got some more bullets and will be testing at further distance now that the snow is going.
It is a 6XC with PRVI 22-250 brass. hrn 105gr BTHP bullets - very interesting stuff Hrn is now doing to their bullet. If they shoot at LR as they are at 100yds, they will certainly drop the cost per bang.
I have no problem forming brass as it has always been a part of my shooting including with the 308 Win. Outside neck turning... you bet. I will definitely do this regardless.
You can mechanise this process so it only takes a few seconds to turn a case. Given all the positives, it is a must do step for me. Critical if using bushing type dies.
Loose the brass, no problem. PRVI is well priced and loosing brass with a few firings on it, part of the cost of shooting.
I know the rules do not let you use a "solid" bipod at most matches. My testing was done with my MPOD which is what I use for FTR shooting. At 13oz, no different in weight then a Harris but so much more stable. If the rules were to change, this would be my goto bipod. I would hang if off the pack when not needed.
I am constantly looking for new ideas from every discipline. Picked up a bunch of good ideas from other sports over the years.
Jerry
PS - consider the 6.5-06. Very accurate and you get more rds in a mag. Brass of course is dirt cheap to source.
